Update README.md (#33)

* Update README.md

* Add quick start

* Update README.md

* Update README.md

* Update README.md

README.md

@@ -2,27 +2,19 @@
 
 [![Build Status](https://travis-ci.com/trailofbits/manticore.svg?token=m4YsYkGcyttTxRXGVHMr&branch=master)](https://travis-ci.com/trailofbits/manticore)
 
-Manticore is a symbolic execution engine for binary analysis, usable as a
-command line tool or Python Library (pre-alpha).
-
-It executes multiple paths of a program simultaneously by replacing input data
-with a set of constraints representing all possible values of that data,
-allowing it to thoroughly discover numerous paths as the program executes
-control flow. By solving the constraints with a theorem prover, Manticore
-generates concrete inputs to trigger discovered paths.
+Manticore is a prototyping tool for dynamic binary analysis, with support for
+symbolic execution, taint analysis, and binary instrumentation.
 
 ## features
 
 - **Input Generation**: Manticore automatically generates inputs that trigger
   unique code paths.
-- **Defect Discovery**: Manticore discovers program defects enabling memory
-  safety violations and generates inputs to trigger them.
+- **Crash Discovery**: Manticore discovers inputs that crash programs via
+memory safety violations.
 - **Execution Tracing**: Manticore records an instruction-level trace of the
   program's execution for each generated input.
-- **Concolic Execution**: Manticore loads memory dumps of running Windows
-  programs to allow deep state space exploration.
-- **Programmatic Interface** (pre-alpha): Manticore exposes programmatic access
-  to its symbolic execution engine via a Python API.
+- **Programmatic Interface** (beta): Manticore exposes programmatic access
+  to its analysis engine via a Python API.
 
 ## scope
 
@@ -30,25 +22,56 @@ Manticore supports binaries of the following formats, operating systems, and
 architectures. It has been primarily used on binaries compiled from C and C++.
 
 - OS/Formats: Linux ELF, Windows Minidump
-- Architectures: x86, x86_64, ARMv7
+- Architectures: x86, x86_64, ARMv7 (partial)
 
 ## requirements
 
 Manticore is officially supported on Linux and uses Python 2.7.
 
-### required dependencies
+## installation
 
-- Python Dependencies: Run `pip install -r requirements.txt`
-- Z3 Theorem Prover: Download the latest release for your platform from https://github.com/Z3Prover/z3/releases/latest, and place the enclosed `z3` binary in your `$PATH`.
+From the root of the Manticore repository, run:
 
-### development dependencies
+```
+pip install .
+````
 
-- keystone: Used in unit tests
+or, if you would like to do a user install:
+
+```
+pip install --user .
+```
+
+This installs the Manticore CLI tool (`manticore`) and the Python API.
+
+Then, install the Z3 Theorem Prover. Download the latest release for your
+platform from https://github.com/Z3Prover/z3/releases/latest, and place the
+enclosed `z3` binary in your `$PATH`.
+
+> Note: Due to a known [issue](https://github.com/aquynh/capstone/issues/445),
+  Capstone may not install correctly. If you get this error message,
+  "ImportError: ERROR: fail to load the dynamic library.", or another related
+  to Capstone, try reinstalling via `pip install -I --no-binary capstone`
+
+## quick start
+
+After installing Manticore, here is some basic usage you can try.
+
+```
+cd examples/linux
+make
+manticore basic  # a mcore_* directory is created
+cat mcore_*/*1.stdin | ./basic
+cat mcore_*/*2.stdin | ./basic
+
+cd ../script
+python count_instructions.py ../linux/helloworld
+```
 
 ## usage
 
 ```
-python main.py ./path/to/binary  # runs, and creates a directory with analysis results
+$ manticore ./path/to/binary  # runs, and creates a directory with analysis results
 ```
 
 or
@@ -71,3 +94,19 @@ def hook(state):
 
 m.run()
 ```
+
+## FAQ
+
+### How does Manticore compare to [angr](http://angr.io)?
+
+In short, Manticore is simpler. Manticore is a smaller codebase, and has fewer
+dependencies and features. Accordingly, Manticore may also be slower,
+for example, due to having less symbolic execution optimizations and techniques
+implemented.
+
+Generally speaking, a subset of the analyses that can be implemented with angr,
+can be implemented with Manticore, however if you’ve used neither, you may find
+Manticore to have a slightly less steep learning curve. Additionally, if you
+come from a reverse engineering or exploitation background, you may find
+Manticore intuitive due to its lack of intermediate representation and overall
+emphasis on staying close to machine abstractions.